Example image of eyePlorer eyePlorer map for 'Refracting telescope': Dioptrics Lens (optics) Objective (optics) Optical telescope Telescope Astronomy Telephoto lens Alkmaar Hans Lippershey Jacob Metius Middelburg Netherlands Sacharias Jansen Galileo Galilei Venice Doge of Venice Leonardo Donato Brightness Clarity Eyepiece Light Magnification Refraction Virtual image Cardinal point (optics) Focal point Parallel (geometry) Galilean moons Impact crater Moon Phases of Venus Johannes Kepler Aerial telescope F-number Focal length Johannes Hevelius Achromatic lens Chester Moore Hall John Dollond Chromatic aberration Crown glass (optics) Dispersion (optics) Flint glass Glass Spherical aberration Polishing Wavelength Great Paris Exhibition Telescope of 1900 Great refractor Fluorite
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